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Although zirconium belongs to 4d transition …

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Although zirconium belongs to 4d transition series and hafnium to 5d transition series even them they show similar physical and chemical properties because

Posted by Ahuja Yadav 2 years, 1 month ago

CBSE > Class 12 > Chemistry

1 answers

Meemansha Srivastava 2 years, 1 month ago

As we go down the group the size of the atoms should increase. This trend is seen till 4d series. In 5d series the electrons fill in the penultimate shell i.e in the d subshell. The sheilding effect by the electrons in the d subshell is less than the attractive force between the electrons in the last subshell and the increasing nuclear charge. Thus the size of the atom reduces (This phenomenon is called as lanthanoid contraction). The expected increase in size of the 5d series is compensated by lanthanoid contraction and hence 4d and 5d series have almost the same size resulting them to have similar physical and chemical properties.

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